High-performance backend truenas scale nextcloud talk can’t connect

[scubamuc]

@willi4m

  'trusted_domains' => 
  array (
    0 => '127.0.0.1',
    1 => '192.168.x.71:30027',
    2 => 'localhost',
    3 => 'nextcloud',
    4 => 'nextcloud.xxx.biz.xx',
    5 => 'signal.xxx.biz.xx',

why is you signal server in trusted domains?

@willi4m

[WARN] Janus is deployed on a private address (172.16.18.2) but you didn't specify any STUN server! Expect trouble if this is supposed to work over the internet and not just in a LAN...

this seems to be pointing to your issue. looks like its not proxied correctly and has no valid certificate.
is signal internet facing and forwarded to a valid encrypted domain https://your.signal.domain.tld?

also double check

Allow inbound bypass for TURN & STUN on port 3478 tcp/udp which must be internet facing in router/firewall (i.e your.domain.tld:3478)

be aware, that the above example is a standalone docker service! consider requesting assistance from the truenas folks.